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linux - How to quickly find out if a *nix server is running OK?

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Often when I find myself in front of a
unix/linux (or any other *nix variant) console and have to quickly diagnose the server's
condition, I just can't remember everything that should be
checked.



I'll try a vmstat, some ps/top
manoeuvres, read procinfo and some log files (boot & sys), but what I'd really like
is a quick way to view Cpu, Hard disk and Physical Memory
condition.



I seem to know a lot of it already is
present in vmstat, but somehow I miss the ease of server 2008 where you can find a nice
resource monitor while even the task manager itself can provide a quick peek on the
system condition (and not even talking about server 2008's monitoring graph
tools).



Any suggestion, or am I just being lame
because vmstat really is the grail ?




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Edit:
Well thanks for the feedback,
everyone. I should add that I'm not really talking about constant monitoring (where
nagios is a very good proposition), but about an occasional walk to a server - not
necessarily mine - to do a quick system condition lookup (sometimes I just happen to be
somewhere and Bang, Hey, can you come over to check this one
?)



The stick with some utility-scripts is indeed
nice, already have one with sysinternals apps for windows machines. Htop is cool also,
although I don't think being able to install it wherever I happen to
be.



Answer




top is a good
tool (if its installed), but the other one I like for a real quick look to see if
anything is wrong is dmesg. That should let you know if the
server's experiencing something incredibly major (disconnected nics, disk faults, memory
faults etc).


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